I saw a programme on TV that tried to be all emotive about how paedophiles are hard done by and can't help the attraction, they need help not vilification.
I was pretty astounded as paedophiles are aroused and attracted to children, not teenagers, that's a different name altogether and just as wrong.
You know it's not right so why do it? I hope I don't offend anyone but former alcoholics and drug addicts still have the addiction part, they know they have to control it. Would you go round his parents for tea and biscuits with his DP, knowing in his head he could be imagining all sorts with your DC. I think not.
Some crimes, involving minors, vulnerable people, women and the elderly are not tolerated inside prison. I don't think there's anyway to be magically cured apart from castration. In which hopefully any sexual urges for anything are removed.
Like PP has said there's no ideal place for him to live. The petition will likely come to nothing. But I'd never defend such a person. I don't know if you're missing out on the fact that with child porn, children are being abused and getting hurt, never mind if he did more than that.
With everything going on in the world you need to pick your battles more wisely!